Figure 3 outlines a method that can be used to extract DNA from fruit - Edexcel - GCSE Biology Combined Science - Question 2 - 2016 - Paper 1
Question 2
Figure 3 outlines a method that can be used to extract DNA from fruit.
Crush fruit with a buffer solution containing detergent
Filter the mixture
Add ethanol and ... show full transcript
Worked Solution & Example Answer:Figure 3 outlines a method that can be used to extract DNA from fruit - Edexcel - GCSE Biology Combined Science - Question 2 - 2016 - Paper 1
Step 1
Give a reason for filtering the mixture.
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Answer
Filtering the mixture is important to remove large solid particles, such as fruit pulp and cellular debris, which could interfere with the extraction process of DNA. By filtering, you ensure that only the liquid portion containing the dissolved DNA is collected for the subsequent steps.
Step 2
What is the role of the ethanol?
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Answer
The role of ethanol in this procedure is to precipitate the DNA. When ethanol is added to the filtered mixture, it causes the DNA to clump together and become visible, allowing for its collection. Therefore, the correct answer to this question is D.
